and the deviation of the affine connection \(\Gamma ^{\lambda }_{\;\;\;\mu \nu }\)  from the Levi-Civita one defines the distortion tensor [1]}
\(N^{\lambda }_{\;\;\;\;\mu \nu }:=\Gamma ^{\lambda }_{\;\;\;\mu \nu }-\widetilde{\Gamma }^{\lambda }_{\;\;\;\mu \nu }=\frac{1}{2}g^{\alpha \lambda }(Q_{\mu \nu \alpha }+Q_{\nu \alpha \mu }-Q_{\alpha \mu \nu }) -g^{\alpha \lambda }(S_{\alpha \mu \nu }+S_{\alpha \nu \mu }-S_{\mu \nu \alpha }) \) 
